CN109586150B - Hectowatt-level continuous single-frequency all-solid-state laser realized by single resonant cavity - Google Patents
Hectowatt-level continuous single-frequency all-solid-state laser realized by single resonant cavity Download PDFInfo
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
Abstract
The invention discloses a hectowatt-level continuous single-frequency all-solid-state laser realized by a single resonant cavity, when the hectowatt-level all-solid-state continuous single-frequency laser is realized by a single-ring resonant cavity, an injection locking amplification technology is not needed, and the relative cost is lower; the phenomenon that a single resonant cavity with a single crystal inserted in the cavity narrows a stable region of the laser due to a thermal effect during high-power pumping and the limitation of a damage threshold value of the single crystal on the output power are overcome, and the output power of the laser has a large lifting space; when the single resonant cavity realizes the all-solid-state continuous single-frequency laser with high beam quality and high power, the cavity structure of the laser is compact, the integration is easy, and the commercial production is easy to realize; the method can be used for realizing the high-light conversion efficiency, high-beam quality and high-power all-solid-state continuous single-frequency laser of end pumping and side pumping.
Description
Technical Field
The invention belongs to the technical field of laser, and relates to a hectowatt-level continuous single-frequency all-solid-state laser realized by a single resonant cavity.
Background
The all-solid-state single-frequency laser has the advantages of compact structure, small volume, good beam quality, high long-term power stability, low intensity noise and the like under the condition of high output power, and thus the all-solid-state single-frequency laser is widely applied to the fields of quantum information, quantum communication, gravitational wave detection and the like. With the development of science and technology, people put forward higher requirements on the output power of all-solid-state lasers, because in the precise measurement of weak signals represented by gravitational wave detection, the all-solid-state lasers with high output power can improve the signal-to-noise ratio of a measuring device, and further improve the measurement precision.
The method for realizing the high-power all-solid-state laser in the single resonant cavity at present is to reduce the heat introduced by quantum loss in the pumping process by utilizing a direct pumping mode, improve the absorption efficiency of pumping light by utilizing a long rod crystal with proper doping concentration, realize the effective compensation of the astigmatism of the resonant cavity and the astigmatism of a thermal lens of a gain crystal by designing a cavity structure, force the unidirectional operation of the laser by inserting an isolator in a ring-shaped resonant cavity, and realize the single-frequency mode-hop-free operation of the laser by introducing nonlinear loss by inserting a nonlinear crystal. The continuous single-frequency output power of the single resonant cavity is limited below a hundred watt level by the thermal effect of the gain crystal in the single resonant cavity and the limitation of the thermal damage threshold of the gain crystal.
One implementation method of a hectowatt-level continuous single-frequency all-solid-state laser adopts a traveling wave amplification device. The traveling wave amplification has no resonant cavity, the amplification mode is simple, the complexity of a light path is increased by increasing the laser amplification stage number to realize high-power laser output, the output light beam of the amplifier is degraded by gradual accumulation of the thermal effect of the gain crystal, and the realization of a high-power high-beam-quality laser is further limited. The output power of the traveling wave amplifier is greatly dependent on the saturation degree of the optical power of the seed, and the optical power of the seed limits the further improvement of the power of the traveling wave amplifier.
The injection locking amplification technology is adopted in another implementation mode of the hectowatt continuous single-frequency all-solid-state laser. The locked high-power resonant cavity has a filtering function, and the injection locking amplifier can realize high output power and good beam quality at the same time. In the injection locking amplifier, the realization of hundred watt continuous single-frequency laser output depends on the adoption of a locking loop to accurately lock the oscillation frequency of a high-power resonant cavity to the oscillation frequency of a seed source laser, and the adoption of a plurality of sets of frequency stabilization systems to improve the frequency stability of the seed source laser and the high-power laser. The use of a plurality of sets of locking loops and frequency stabilization systems ensures that the obtained hundred watt all-solid-state continuous single-frequency laser system is more sensitive to external interference. The locking bandwidth of the injection locking amplifier is wide, the dependence of the output power on the power saturation degree of the seed light is large, and a plurality of sets of front laser amplifiers are needed to be adopted in an actual hectowatt injection locking amplification system to improve the output power of the low-power seed source laser, so that the complexity of the system is further increased, and the realization of a commercialized hectowatt all-solid-state continuous single-frequency laser with a compact structure is not facilitated.
At present, a side-pumped ring resonator is adopted in the existing report, two gain crystals are inserted in the cavity, and because better mode matching cannot be realized between the two gain crystals, a stable working region of a laser cannot be actively controlled, a secondary mode in generated laser cannot be effectively inhibited, so that the output power of the obtained continuous single-frequency laser is below a hundred watt level, the light-light conversion efficiency is low, and the long-term single-frequency stable running characteristic is poor. In other reports, 213W single transverse mode laser output is realized under the condition of adopting four end-pumped gain crystals, the realization of the single-frequency operating characteristic of the laser depends on an injection locking amplification technology, the light-light conversion efficiency is low, and the further power lifting space is small. The adoption of the injection locking amplification technology increases the complexity of the system, the use of a multipath locking loop increases the sensitivity of the hectowatt system to the interference of the external environment, and the large optical path system and the complex locking loop are not beneficial to the realization of integration and commercialization.
Disclosure of Invention
The invention aims to avoid the defects of the prior art and provides a hectowatt-level continuous single-frequency all-solid-state laser realized by a single resonant cavity.
The purpose of the invention can be realized by adopting the following technical measures, and the invention designs a single resonant cavity to realize a hectowatt-level continuous single-frequency all-solid-state laser, which comprises the following steps: comprises a first cavity mirror 1, a second cavity mirror 2, a third cavity mirror 3 and n cavity mirrors S1-SnForming a ring-shaped resonant cavity, wherein n is more than or equal to 2; setting the position of each cavity mirror to make the cavity mirror S1-Sn-1The incident light and the emergent light are vertical to each other;
inserting n pieces of gain crystal LC in ring resonant cavity1-LCnEach gain crystal is correspondingly arranged on an emergent light path close to the cavity mirror with the same number subscript; and n pump sources PL1-PLnEach gain crystal is pumped by a pump source independently;
gain crystal LC in ring resonatorn-1And LCnAn n-component image system (fn-1, fn) consisting of lenses fn-1 and fn is arranged on the light path between the two, so that the cavity mode and the pumping mode are realized in n gain crystals LC1-LCnThe mode of the laser is well matched and the working stable region of the laser is controlled, and the mode of high power output is ensured to be a TEM00 mode by controlling the size of a cavity mode of the laser on a gain crystal;
in the ring resonant cavityThe inserted isolator 4 forces the laser to realize stable unidirectional operation; wherein, the isolator 4 is arranged on the first cavity mirror 1 and the cavity mirror S1On the optical path therebetween;
nonlinear loss introduced by the nonlinear crystal 5 inserted into the annular resonant cavity inhibits multimode oscillation and mode hopping of the laser, and single-frequency stable operation of the laser is realized; the nonlinear crystal 5 is arranged on the light path between the second mirror 2 and the third mirror 3;
the second cavity mirror 2 and the third cavity mirror 3 in the ring-shaped resonant cavity are plano-concave mirrors, so that when the nonlinear crystal 5 is inserted into the focusing beam waist of the second cavity mirror 2 and the third cavity mirror 3, the nonlinear crystal 5 can introduce enough nonlinear loss in the resonant cavity to inhibit the multimode oscillation and mode hopping of the laser.
Compared with the prior art, the invention has the advantages that when the single-ring resonant cavity realizes the hundred watt all-solid-state continuous single-frequency laser, the injection locking amplification technology is not needed, and the relative cost is low; the phenomenon that a single resonant cavity with a single crystal inserted in the cavity narrows a stable region of the laser due to a thermal effect during high-power pumping and the limitation of a damage threshold value of the single crystal on the output power are overcome, and the output power of the laser has a large lifting space; when the single resonant cavity realizes the all-solid-state continuous single-frequency laser with high beam quality and high power, the cavity structure of the laser is compact, the integration is easy, and the commercial production is easy to realize; the method can be used for realizing the high-light conversion efficiency, high-beam quality and high-power all-solid-state continuous single-frequency laser of end pumping and side pumping.
Drawings
Fig. 1 is a schematic structural diagram of a single resonant cavity for realizing end-face pumping in a hectowatt-level continuous single-frequency all-solid-state laser provided by the invention.
Fig. 2 is a schematic structural diagram of a single resonant cavity for realizing side pumping in a hectowatt-level continuous single-frequency all-solid-state laser provided by the invention.
Detailed Description
The technical solution of the present invention will be further described in more detail with reference to the following embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a single resonant cavity for achieving end-pumping in a hectowatt-level continuous single-frequency all-solid-state laser provided by the present invention. The method comprises the following steps:
by cavity mirror S1-SnA ring resonant cavity consisting of a first cavity mirror 1, a second cavity mirror 2 and a third cavity mirror 3, and n pieces of gain crystal LC1-LCnAnd n gain crystals LC1-LCnCorresponding n pump sources PL1-PLnAn isolator 4 and n gain crystals LC1-LCnA corresponding imaging system (f1, f2) - (fn-1, fn), a nonlinear crystal 5, wherein n ≧ 2. By inserting n gain crystals LC in the cavity1-LCnEach gain crystal is pumped PL by a pump source independently1-PLnThe phenomenon that the stable region of the laser is narrowed due to the heat effect when a single resonant cavity with a single crystal inserted in the cavity is pumped at high power and the limitation of the damage threshold value of the single crystal to the output power are overcome, so that the output power of the laser is improved in a large space; the isolator 4 inserted in the resonant cavity forces the laser to realize stable unidirectional operation; the multiple groups of imaging systems (f1, f2) - (fn-1, fn) composed of the lenses fn-1 and fn enable the laser to realize that a resonant cavity mode and a pumping waist spot can realize better mode matching at n gain crystals, and the working stable region of the laser and the size of the cavity mode at the gain crystals are controlled by controlling the distance between two lenses of each imaging system so as to ensure that the mode of high power output is a TEM00 mode; the nonlinear loss introduced by the nonlinear crystal 5 inhibits the multimode oscillation and mode hopping phenomenon of the laser, and single-frequency stable operation of the laser is realized.
Inserting n pieces of gain crystal LC in single ring-shaped resonant cavity1-LCnEach gain crystal is pumped PL by a pump source independently1-PLnOvercomes the defect that a single resonant cavity with a single crystal inserted in the cavity is used in a high-power pumpThe phenomenon that the stable region of the laser is narrowed due to the thermal effect during pumping and the limitation of the damage threshold value of a single crystal to the output power, and the output power of the laser has a large lifting space.
The isolator 4 inserted into the annular resonant cavity effectively eliminates the spatial hole burning effect of the laser, and the second cavity mirror 2 and the third cavity mirror 3 in the resonant cavity ensure that the nonlinear crystal 5 is placed at the focusing beam waist of the two and has enough nonlinear loss to be introduced into the resonant cavity. The continuous single-frequency laser output of the laser is realized by using a ring laser inserted with a isolator 4 and a nonlinear crystal 5.
The stable and mode-hopping-free operation of the high-power all-solid-state laser is realized by inserting the isolator 4 into the ring resonator to force the ring laser to realize stable one-way operation and the combined action of nonlinear loss introduced by the nonlinear crystal 5 to inhibit the multimode oscillation and mode hopping phenomenon of the laser.
Lenses in each imaging system (f1, f2) - (fn-1, fn) to the corresponding gain crystal LC1-LCnThe distance of the main planes is the focusing length of the lens. In the design process of the laser cavity structure, under the condition of considering the gain crystal thermal effect, the working stable region of the laser needs to be simulated by the ABCD transmission matrix along with the change of the distance between the lenses in each imaging system, and further, the cavity structure parameters of the high-power ring laser which can adapt to the gain crystal thermal effect under the condition of specific pumping power injection can be obtained. By controlling the distance between the imaging lenses, not only can good mode matching of the cavity mode and the pumping mode at each gain crystal and control of the stable region and the output power of the laser be realized, but also the size of the cavity mode of the laser at the gain crystal can be controlled to ensure that the mode with high power output is the TEM00 mode. The beam waist radius of a laser cavity mode of the laser at the gain crystal needs to satisfy the condition of being less than dA/4.6 so as to avoid the diffraction phenomenon caused by the overlarge beam waist of the laser cavity mode at the gain crystal, wherein dA is the transverse diameter of the gain crystal.
The transmissivity of the output coupling mirror of the laser is selected to simultaneously meet the conditions of high power output and single-frequency operation of the laser. Under the condition of single-frequency operation, the linear loss and the nonlinear loss in the resonant cavity satisfy
Wherein the content of the first and second substances,
I0the parameter is a saturation parameter of the gain crystal, and eta is a nonlinear conversion coefficient of the nonlinear crystal, and can be obtained by calculation according to a phase matching mode of the nonlinear crystal and parameters of the nonlinear crystal;
g0is the small signal gain factor, l is the length of the nonlinear crystal,
g0l＝KPin (2)
wherein, K is a pumping factor, and Pin is pumping power;
△λgthe gain bandwidth is defined as l is the length of the nonlinear crystal, and cons represents a constant corresponding to the product of the nonlinear receiving bandwidth of the frequency doubling crystal and the length of the frequency doubling crystal; α 0 is the normalized linear loss, expressed as:
where L is the linear loss in the cavity and t is the transmittance of the output coupling mirror. Alpha is alpha0As a function of the transmittance t of the output coupling mirror included. Under a specific cavity structure, the loss in the cavity is a fixed value, the nonlinear conversion coefficient of the nonlinear crystal is also a value which can be actually controlled and determined, and the optimal transmittance t of the output coupling mirror of the laser corresponding to the single-frequency operating characteristic can be calculated by using the formulas (1) to (3) while the laser outputs the laser power as high as possible under the specific injection power.
N gain crystals LC inserted in cavity1-LCnThe laser output power can be predicted by using a theoretical model of the laser under a theoretical model under a steady-state condition. The total small gain coefficient of the all-solid-state continuous single-frequency laser in a stable running state is n gain crystals LC1-LCnThe sum of the resulting small gain factors, the intensity of the fundamental light in the cavity under steady state conditions can be expressed as:
wherein t is the transmittance of the output coupling mirror, L is the intra-cavity linear loss, and η is the nonlinear conversion coefficient of the nonlinear crystal 5, which can be calculated according to the phase matching mode of the nonlinear crystal and the parameters of the nonlinear crystal.
The output power of the fundamental wave can be expressed as:
Pf＝AtI (5)
the output power of the second harmonic can be expressed as:
Psh＝ηAI2 (6)
where Pf is the fundamental output power, Psh is the second harmonic output power, and a is the cross-sectional area of the laser beam in the gain crystal. When the cavity structure of the laser is determined, the nonlinear conversion coefficient eta of the nonlinear crystal is a determined value. The intracavity loss of a high power laser is a definite value. The final output power of the high power laser cavity can then be predicted using equations (4) - (6).
The first implementation mode comprises the following steps: FIG. 1 is a schematic diagram of a structure of an end-pumped high-beam-quality high-power all-solid-state continuous single-frequency ring laser, which adopts a ring resonator structure and is composed of a cavity mirror S1-Sn, a first cavity mirror 1, a second cavity mirror 2 and a third cavity mirror 3, and adopts an end-pumped pumping mode, wherein a pumping source is a laser diode PL (laser diode) with fiber coupling output1-PLn. The cavity mirror S1-Sn is a 45-degree plane mirror, the pump incident end face is plated with a pump light high-transmittance film, and the other end face is plated with a pump light high-transmittance and fundamental frequency light high-reflection film; the first cavity mirror 1 is incident at 55 degreesThe end surface of the plane mirror is plated with a fundamental frequency light high-reflection film; the second cavity mirror 2 and the third cavity mirror 3 are plano-concave mirrors with 10-degree incidence, and the concave surface of the second cavity mirror 2 is coated with a film with high reflection to the fundamental frequency light; the concave coating of the third cavity mirror 3 has certain transmissivity to the high transmission of the frequency doubling light and the fundamental frequency light, and the transmissivity of the output coupling mirror in the laser is selected by combining the formulas (1) to (3) in the invention, so that higher continuous single-frequency laser output can be output at specific pumping power. By inserting n individual pumps (pump sources PL) in a single ring resonator1-PLn) Gain crystal LC1-LCnThe laser can overcome the phenomenon that the stable region of the laser is narrowed due to the thermal effect when a single resonant cavity with a single crystal inserted therein is pumped at high power and the limitation of the damage threshold value of the single crystal on the output power, the power of the laser has no upper limit, and the output power of the laser has large lifting space. Ring resonant cavity n-block gain crystal LC1-LCnAn imaging system (f1, f2) - (fn-1, fn) is inserted between the two gain crystals to realize good mode matching of a cavity mode and a pumping mode at n gain crystals, the stable region and the output power of the laser are controlled by controlling the distance between two lenses of each imaging system, and the size of the cavity mode of the laser in the gain crystals is controlled to ensure that the mode of high-power output is a TEM00 mode; the light-passing surface of the gain crystal is cut into a certain wedge angle, which plays the role of a polarization beam splitter and is convenient for maintaining the stability of the polarization state of the laser. The gain crystal is coated by indium thin layer and is welded in red copper temperature control furnace by vacuum indium, the temperature is controlled by thermoelectric refrigerator (TEC), the heat sink is red copper block with cooling circulating water. The gain crystal may also be directly water cooled. The optical isolator 4 is inserted into the annular resonant cavity to eliminate the space hole burning effect so as to ensure the stable unidirectional operation of the laser, and the stable unidirectional operation of the laser is one of the basic conditions for realizing high-power output. The nonlinear crystal 5 is located at the beam waist of the fundamental mode between the second cavity mirror 2 and the third cavity mirror 3 to ensure high nonlinear conversion efficiency, so that enough nonlinear loss is introduced into the resonant cavity to inhibit mode hopping and multimode oscillation of the laser, which is one of necessary conditions for realizing a high-stability laser. The nonlinear crystal 5 may be temperature phase-matched or angle phase-matchedAnd the material of the nonlinear crystal is not limited.
The second embodiment: fig. 2 is a schematic diagram of a structure of a side-pumped high-beam-quality high-power all-solid-state continuous single-frequency ring laser, which adopts a ring resonator structure, is composed of cavity mirrors 6 and 7, a second cavity mirror 2 and a third cavity mirror 3, and adopts a side-pumped pumping mode. The cavity mirrors 6 and 7 are concave-convex mirrors with certain angle incidence and certain curvature radius, the concave surface is plated with a pumping light high-transmittance film, and the convex surface is plated with a pumping light high-transmittance and fundamental frequency light high-reflection film; the second cavity mirror 2 and the third cavity mirror 3 are plano-concave mirrors with certain incident angles, and the concave surface of the second cavity mirror 2 is coated with a film with high reflection to the fundamental frequency light; the concave coating of the third cavity mirror 3 has certain transmissivity to the high transmission of the frequency doubling light and the fundamental frequency light, and the transmissivity of the output coupling mirror in the laser is selected by combining the formulas (1) to (3) in the invention, so that higher continuous single-frequency laser output can be output at specific pumping power. The phenomenon that a single resonant cavity with the inserted monolithic crystal is narrowed in a stable region of a laser due to a thermal effect during high-power pumping and the limitation of a damage threshold value of the monolithic crystal on output power can be overcome by inserting n blocks of individually pumped (pump sources PL1-PLn) gain crystals LC1-LCn into the single annular resonant cavity, the power boost of the laser has no upper limit, and the output power boost space of the laser is large. Imaging systems (f1, f2) - (fn-1, fn) are inserted between n gain crystals LC1-LCn of the ring resonant cavity to realize good mode matching of a cavity mode and a pumping mode at the n gain crystals, the stable region and the output power of the laser are controlled by controlling the distance between two lenses of each imaging system, and the size of the cavity mode of the laser in the gain crystals is controlled to ensure that the mode of high power output is a TEM00 mode. The gain crystal can be coated by indium film and is welded in red copper temperature control furnace by vacuum indium, the temperature is controlled by thermoelectric cooler (TEC), the heat sink is red copper block with cooling circulating water, the gain crystal can also adopt direct water cooling mode. The optical isolator 4 is inserted into the annular resonant cavity to eliminate the space hole burning effect so as to ensure the stable unidirectional operation of the laser, and the stable unidirectional operation of the laser is one of the basic conditions for realizing high-power output. The nonlinear crystal 5 is located at the beam waist of the fundamental mode between the second cavity mirror 2 and the third cavity mirror 3 to ensure high nonlinear conversion efficiency, so that enough nonlinear loss is introduced into the resonant cavity to inhibit mode hopping and multimode oscillation of the laser, which is one of necessary conditions for realizing a high-stability laser. The nonlinear crystal 5 may be temperature phase-matched or angle phase-matched, and the material of the nonlinear crystal is not limited.
Compared with the prior art, the invention has the advantages that when the single-ring resonant cavity realizes the hundred watt all-solid-state continuous single-frequency laser, the injection locking amplification technology is not needed, and the relative cost is low; the phenomenon that a single resonant cavity with a single crystal inserted in the cavity narrows a stable region of the laser due to a thermal effect during high-power pumping and the limitation of a damage threshold value of the single crystal on the output power are overcome, and the output power of the laser has a large lifting space; when the single resonant cavity realizes the all-solid-state continuous single-frequency laser with high beam quality and high power, the cavity structure of the laser is compact, the integration is easy, and the commercial production is easy to realize; the method can be used for realizing the high-light conversion efficiency, high-beam quality and high-power all-solid-state continuous single-frequency laser of end pumping and side pumping.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A single resonant cavity realizes continuous single-frequency full solid-state laser of hectowatt level, its characterized in that includes:
comprises a first cavity mirror (1), a second cavity mirror (2), a third cavity mirror (3) and n cavity mirrors S1-SnForming a ring-shaped resonant cavity, wherein n is an even number more than or equal to 2; setting the position of each cavity mirror to make the cavity mirror S1-Sn-1The incident light and the emergent light are vertical to each other;
inserting n pieces of gain crystal LC in ring resonant cavity1-LCnEach gain crystal is correspondingly arranged on an emergent light path close to the cavity mirror with the same number subscript; bag for returningComprising n pump sources PL1-PLnEach gain crystal is pumped by a pump source independently;
gain crystal LC in ring resonatorn-1And LCnAn imaging system (fn-1, fn) consisting of lenses fn-1 and fn is arranged on the light path between the two gain crystals to realize that the cavity mode and the pumping mode are on n gain crystals LC1-LCnThe mode of the laser is well matched and the working stable region of the laser is controlled, and the mode of high power output is ensured to be a TEM00 mode by controlling the size of a cavity mode of the laser on a gain crystal;
the isolator (4) inserted into the annular resonant cavity forces the laser to realize stable unidirectional operation; wherein the isolator (4) is arranged on the first cavity mirror (1) and the cavity mirror S1On the optical path therebetween;
nonlinear loss introduced by a nonlinear crystal (5) inserted into the annular resonant cavity inhibits multimode oscillation and mode hopping of the laser, and single-frequency stable operation of the laser is realized; the nonlinear crystal (5) is arranged on a light path between the second cavity mirror (2) and the third cavity mirror (3);
the second cavity mirror (2) and the third cavity mirror (3) in the ring-shaped resonant cavity are plano-concave mirrors, so that when the nonlinear crystal (5) is inserted into the focusing beam waist of the second cavity mirror (2) and the third cavity mirror (3), the nonlinear crystal (5) can introduce enough nonlinear loss in the resonant cavity to inhibit the multimode oscillation and mode hopping of the laser;
under the condition of single-frequency operation, the linear loss and the nonlinear loss in the resonant cavity satisfy
Wherein the content of the first and second substances,
I0the parameter is a saturation parameter of the gain crystal, and eta is a nonlinear conversion coefficient of the nonlinear crystal, and can be obtained by calculation according to a phase matching mode of the nonlinear crystal and parameters of the nonlinear crystal;
g0is the small signal gain factor, l is the length of the nonlinear crystal,
g0l＝KPin (2)
wherein, K is a pumping factor, and Pin is pumping power;
△λgfor gain bandwidth, the nonlinear crystal is a frequency doubling crystal; cons represents a constant corresponding to the product of the nonlinear receiving bandwidth of the frequency doubling crystal and the length of the frequency doubling crystal; alpha is alpha0For normalized linear loss, expressed as:
wherein, L is the linear loss in the cavity, and t is the transmittance of the output coupling mirror; alpha is alpha0As a function of the transmittance t comprising the output coupling mirror; under a specific cavity structure, the optimal transmissivity t of the output coupling mirror of the laser corresponding to the single-frequency operation characteristic can be calculated by using the formulas (1) to (3) under specific injection power, and the requirement that the laser outputs the laser power as high as possible is met.
2. The single-cavity full solid-state laser capable of realizing a continuous single frequency at hectowatt level according to claim 1, wherein the number of gain crystals in the ring cavity has no upper limit, and the output power of the laser has a large lifting space.
3. The single-cavity continuous single-frequency all-solid-state laser device according to claim 1, wherein the gain crystal is a solid-state gain medium, and is one or more of a slab-shaped gain medium, a rod-shaped gain medium, and a single crystal fiber.
4. The single-cavity continuous single-frequency all-solid-state laser according to claim 1, wherein the nonlinear crystal is a nonlinear medium generating nonlinear effects, and the phase matching mode is angle phase matching and/or temperature phase matching.
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| JP3512051B2 (en) * | 1996-06-06 | 2004-03-29 | ソニー株式会社 | Laser light generator |
| CN2572625Y (en) * | 2002-08-05 | 2003-09-10 | 华北光电技术研究所 | Laser amplifying module |
| CN101697398B (en) * | 2009-10-29 | 2011-04-20 | 哈尔滨工程大学 | Common output mirror thulium and holmium co-doped yttrium lithium fluoride single-frequency pulse laser for master and slave laser purpose |
| CN104577695B (en) * | 2015-01-27 | 2018-04-03 | 山西大学 | High power inner cavity frequency-doubling single-frequency laser |
| CN107579413B (en) * | 2017-09-21 | 2019-02-26 | 山西大学 | A method of extension all-solid-state continuous wave single-frequency laser tuning range |
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| CN106486882A (en) * | 2016-11-16 | 2017-03-08 | 苏州大学 | A kind of new and effective high power loop laser amplifier |
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